Common Blanket Octopus vs small tortoiseshell

Tremoctopus violaceus compared with Aglais urticae

Key Differences

• Common Blanket Octopus is Least Concern while small tortoiseshell is Near Threatened.

Taxonomic Classification

Rank	Common Blanket Octopus	small tortoiseshell
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Mollusca (Mollusks)	Arthropoda (Arthropods)
Class	Cephalopoda (Cephalopods)	Insecta (Insects)
Order	Octopoda (Octopuses)	Lepidoptera (Butterflies & Moths)
Family	Tremoctopodidae	Nymphalidae (Brush-footed Butterflies)
Genus	Tremoctopus	Aglais
Species	Tremoctopus violaceus	Aglais urticae

Evolutionary Relationship

Common Blanket Octopus and small tortoiseshell share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Common Blanket Octopus

LC — Least Concern

small tortoiseshell

NT — Near Threatened

Physical Characteristics

Attribute	Common Blanket Octopus	small tortoiseshell
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Common Blanket Octopus

Habitat

Native to Asia, inhabiting ecosystems characteristic of the region.

Range

Found in Taiwan.

small tortoiseshell

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Found across Europe (41 countries). Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Common Blanket Octopus

The common blanket octopus (<em>Tremoctopus violaceus</em>) is a remarkable pelagic cephalopod mollusc classified as Least Concern on the IUCN Red List, with records indicating its presence in Asian waters, including around Taiwan. The species exhibits extreme sexual dimorphism: females can reach lengths of up to two meters when the cape-like webbing between their dorsal arms is extended, while males are tiny, reaching only a few centimeters. The distinctive webbing, which resembles a flowing blanket, is thought to serve as a defense mechanism, being extended to confuse or deter predators. Females are also known to detach and wield tentacles from the Portuguese man-of-war, to which they are immune, using them as defensive weapons. <em>Tremoctopus violaceus</em> typically inhabits open oceanic waters across tropical and subtropical seas. Biological traits of this species remain poorly documented in the scientific literature.

small tortoiseshell

small tortoiseshell (Aglais urticae) is classified as Near Threatened (NT) on the IUCN Red List. Close to qualifying as threatened, with populations that may become vulnerable without conservation action.